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K-14 Process- alternatives?



 
 
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Old June 3rd 04, 11:43 AM
Frank Webb
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Default K-14 Process- alternatives?

On 30 May 2004 03:55:06 GMT, s (Jazztptman)
wrote:

E6, c41,ra4 all of them have half of a dye (coupler), Cibachrome contains

the whole dye, K14 has dyes added during processing (no dye in emulsion prior
to processing)Cibachrome materials processing depends on destruction of the
dye.

OK, why does everyone have to get so picky here. I answered the original
question in a simple matter so as not to overly complicate the issue. K-14 is
complicated enough without trying to explain the process in detail, and I have
seen many misunderstandings about how it works on previous posts on the
subject.

Yes, Cibachrome is different, which is why I made a passing comment that it WAS
different from E-6, C-41, RA-4, etc...I just didn;t want to get into a full
post on how that process worked since it was not related to this subject.

Yes, the coupler in these other processes forms the imaging dye when it reacts
with oxidized color developer. There is NO coupler in Kodachrome films, it is
part of the individual color developer steps and each layer is reversed (2 by
physical light exposure through special filters, and one by a chemical foggant.

No, there will never be a home kit to do K-14 due to the physical demands of
the process; removal of rem jet backing, special reversal re-exposure filters;
plus the fact that the mixed chemicals have a short shelf life, so they need to
be made from scratch within a reasonable time of being used, and cannot sit on
a dealers shelf for months or years.


Bernie


Bernie;

Your quite right in what you have posted, for thoses that are
interested the K14 process is decscribed in the Focal Press book " LP
Clerc's Photography - Theory & Practice"

Revised 1971 by S. Welford Chapter LI [51] & LVI [56]
 




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